1. C. Breazeal, Sociable machines: expressive social exchange between humans and robots, Ph.D. Thesis, Department of Electrical Engineering and Computer Science, MIT, Cambridge, MA, 2000.
2. F. Hara, H. Kobayashi, Use of face robot for human–computer communication, in: Proceedings of the International Conference on Systems, Man and Cybernetics, 1995, p. 10.
3. B. Duffy, G. Joue, J. Bourke, Issues in assessing performance of social robots, in: Proceedings of the Second WSEAS International Conference, RODLICS, Greece, 2002.
4. B. Duffy, The social robot, Ph.D. Thesis, Department of Computer Science, University College Dublin, 2000.
5. L. Foner, What’s agency anyway? a sociological case study, in: Proceedings of the First International Conference on Autonomous Agents, 1997.